Oh yes most definitely the 8" dob as others have said.
Astro_bot that was a brilliant post.
You should consider bookmarking it and using it again in the future.
Make sure you check out the sky maps link Deeno gave- it's a great site.
Oh! Nearly forgot-
liss79. That's an awesome thing you're doing for your son and I'm sure you will both get great enjoyment from observing the night skies together.